Printing apparatus and control method thereof

Abstract

A control method for a printing apparatus includes: an image defect detecting step of detecting an ejection curve amount of a nozzle in an inkjet head and an image defect from a recordable medium on a surface of which an image is recorded by an image recording part provided with the inkjet head having a plurality of nozzles, and a stamp step of attaching a stamp indicating presence of the image defect on the recordable medium by a stamping device in a case where the image defect is detected, the stamp step differentiating an attachment form of the stamp by the stamping device in accordance with a magnitude of the ejection curve amount of the nozzle.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application claims priority under 35 U.S.C. §119 to Japanese Patent Application No. 2016-051284, filed on Mar. 15, 2016. The above application is hereby expressly incorporated by reference, in its entirety, into the present application.BACKGROUND OF THE INVENTION[0002]Field of the Invention[0003]The presently disclosed subject matter relates to a printing apparatus, and a control method for the printing apparatus, and particularly, to a printing apparatus for detecting a print defect from a recordable medium (print sheet) after printing, and a control method for the printing apparatus.[0004]Description of the Related Art[0005]It is proposed that in a case where a defect is detected from a recordable medium (print sheet) on which an image and the like are printed by a printing apparatus, a stamp and the like are applied on a printed matter in which the defect is detected.[0006]Japanese Patent Application Laid-Open No. 2015-0301...

AI Technical Summary

Benefits of technology

[0014]According to the first aspect, in a case where the image defect (streak) due to the nozzle is detected, it is possible to change the kind of the stamp in accordance with the extent of the streak. Thereby since an operator can recognize the extent of the streak from the stamp, the present embodiment can support an inspection work by the operator and realize efficiency of the inspection work.

[0016]According to the second aspect, it is possible to appropriately perform the detection of the image defect by adjusting the threshold in consideration of a difference in visibility of the image defect for each of the colors of the inks.

[0021]According to the fifth aspect, it is possible to reduce accuracy in detection of the image defect in regard to the yellow ink having a relatively low visibility to the streak.

[0029]According to the presently disclosed subject matter, in a case where the image defect (streak) due to the nozzle is detected, it is possible to change the kind of the stamp in accordance with the extent of the streak. Thereby since an operator can recognize the extent of the streak from the stamp, it is possible to support the inspection work by the operator and realize the efficiency of the inspection work.

Problems solved by technology

Therefore in a case where an operator sorts out the print sheets by inspecting the extent of the defect of the print sheet after imprinting the stamp on the print sheet, the operator can only confirm presence / absence of the detection of the defect by presence / absence of the stamp.

As a result, there is a problem that loads of an inspection work by an operator increase.

As a result, a slight defect is overlooked and the print sheet having the defect is not detected appropriately, creating a possibility that the defect print sheet flows out into end users.

The art described in Japanese Patent Application Laid-Open No. 2002-059606 is configured to attach a backside mark on a mistake printing surface in a case of reuse of a so-called backing sheet, but is not designed to support a sorting work of defect print sheets by an operator.

The art described in Japanese Patent Application Laid-Open No. 9-240120 is designed to, in a case of an invoice or the like with an address, paint out an address part or in a case of a security or a cash voucher, paint out a money amount part thereof, resulting in recognition of being unusable, but is not designed to support a sorting work of defect print sheets by an operator.

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